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The grade away from foundation walls shall fall a minimum of 6 in. within the first l0 ft., except as restricted by lot lines where the fall will be minimum of 6 in. regardless the horizontal distance available. Basement walls, foundation walls, porches, c~rpor% slabs and steps exposed to the weather, and garage floor slabs shall have a minimum specified compressive strength of 3000. Table No. R-302.2 Footings sections: 1~ in. wide - 1 story; 15 in.- 2 story, 18 in. 3 story. Footzngs~h~l ex%end not less than ~in. below the finish natural grade. R-303 ~ Foundation walls shall extend at least 8 in. above the finished grade to the founda- tion at all points. R~304.2 5. Masonry and concrete foundation wails shall be constructed using the following criteria: rai s-shall be pro'v£de all concrete or masonry founda~ tions. Perforated pipe or other approved systems or materials shall be installed at or below the area to be pr'elected and shall discharge by gravity or mechanical means into an approved drainage system. R- 3~5.1 Exterior foundation walls of masonry construction enclosing basements shall be dampproofed, Founda=ion walls of habitable rooms located below grade shall be waterproofed. R-306.1 The minimum net area of' venti- lation openings shall be not less than 1 sq. fi, for each 150 sq, ft. of crawl space area. Openings shall be within 3 ft. of each corner of said building, An access crawl hole lS in. by 24 in. shall be p~o~ided to the underfloor space. R-309,2 The under floor grade shall be cleaned of all vegetation and organic materials. R-309.3 Bathrooms shall be provided wi~h artificial light and an approved mechsnical ventila- t ion system capable o f producing a change of air every 12 minutes or a window of not less than 3 sq. one-half of which must be operable. R-203,3 12. Every sleeping room shall have an ex~erior door or not less than 5.7 sq. ft. of openable window, The min. net clear opening height shall be 24 inches. The min. net clear opening width shall be inches. The finished sill height shall be not more then 44 inches. R-210.2 13. Ail habitable rooms shall be provided with aggregate glazing area of not less than 8 percen~ of the floor area of such rooms. One-half of required area of glazing shall be openable. Where bottom of glass light is within 18 in. of floor and all glass doors and wall panels of bathtub and shower enclosures, must be of laminated, tempered or wire glass. R-208.4 Openings between the garage and residence shall be equipped with solid wood doors not less than I 3/8 in, in ghickness or equivalent 209.1 The garage shall be compleSely separated from ~he residence and its at~ic area by means of 1/2 in. gypsum board or equivalent applied ~o the garage side. R-209.2 17, NO= less than one exit shall be provided from each dwelling unit. The required exit door ~hall be a side-hinged door and not less than 3 ft in width and 6 ft 8 in. iD h~. 211 18. Stairways shall no~ be less than 3 ft in clear width, and the headroom shall be 6 ft 8 in min,, rise 8 1/4 max., and run of 9 in, min. R-213.1 19, Handrails having min. and max. heights of 30 in. and 34 in. respectively, measured~ vertically from the nosing of the treads, shall be provided on at least one side of .stairways of three or more rises and shall be continuous the full length of the stairs and shall extend 6 inches beyond the top and bottom rises, Ends shall be returned or shall terminate in newel post or safety terminals. 214.1